

def sum(a, b:str=12):
  # print(a+b)  #调试
  return  a+b


print(sum(1))
# def avg():
#     print(sum(1,2) / 2)

class Person:
  def __init__(self,name=123):
    self.name=name
    self.age=12
    print('init')



p1=Person()
print(p1)





class xxx():
  def test_xxx(self):
    pass

